<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .cente{
            color: aqua;
            width: 300px;
            height: 300px;

            border: 11px red solid;
            border-top: none;
        }
    </style>
</head>
<body>
    <div class="cente"></div>
</body>
</html>